Dumping ................... waste into the lakes and rivers has caused serious water pollution. (INDUSTRY)

Question 23.
Dumping      waste into the lakes and rivers has caused serious water pollution. (INDUSTRY)
Question 24.
WWF is committed to saving      animals such as black rhino, leatherback turtle and saola. (DANGER)
Question 25.
Here are several      proven studies that describe how to keep fit. (SCIENCE)